III. Titrating the Unknown Acid Determination. 1 Determination 2
Mass of weighing paper plus unknown acid, g .922g .90g
Mass of weighing paper, g .87 g .85 g
Initial buret reading, mL 19.3 mL 27.2 mL
I. Determining the Unknown Acid Sample Size
1. Calculate the mass of the unknown acid required for titrating the acid sample to the equivalence point. Mass of unknown acid is .06 g
2. Calculate the volume of NaOH solution required for titrating the acid sample to the equivalenc. Volume of NaOH solution, mL is 5.7 mL
3. From the mass of unknown acid and the volume of NaOH solution required to titrate it, calculate the mass of the unknown acid requiring 25 mL of NaOH solution for titration.
25mL (.06 g/5.7mL)
Mass of unknown acid requiring 25 mL of NaOH solution for titration, g
Is .263 g
III. Titrating the Unknown Acid
5. Calculate the mass of unknown acid titrated to reach the equivalence point of each titration.
Determination 1 Determination 2
6. From your spreadsheet program analysis, find the volume of NaOH solution required to reach the equivalence point for each titration.
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